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System and method of determining whether to recalibrate a blood pressure monitor

  • US 6,852,083 B2
  • Filed: 01/17/2002
  • Issued: 02/08/2005
  • Est. Priority Date: 04/15/1994
  • Status: Expired due to Fees
First Claim
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1. A method of determining whether to recalibrate blood pressure monitor which calculates blood pressure using a calibration signal from a calibration device indicative of an accurate measurement of the blood pressure of a patient and using a continuous signal from a sensor indicative of a continuous noninvasive measurement of one or more attributes of one or more waves propagating along an artery of the patient, the method characterized by:

  • approximating a function relating a change in a trigger parameter to a change in a pressure-velocity relationship, wherein the pressure-velocity relationship is used to noninvasively determine the blood pressure of a patient;

    calibrating the pressure-velocity relationship using a calibration signal indicative of a first accurate measurement of the blood pressure, and using a continuous signal indicative of a continuous noninvasive measurement of one or more attributes of one or more waves propagating along an artery of a patient;

    calculating a first value of the trigger parameter from the continuous signal;

    calculating the blood pressure using the pressure-velocity relationship and the continuous signal;

    calculating a second value of the trigger parameter from the continuous signal;

    calculating a change in the pressure-velocity relationship by applying the pressure-velocity relationship and the first and second values of the trigger parameter to the function;

    and when the change in the pressure-velocity relationship exceeds a threshold value, recalibrating the pressure-velocity relationship using the continuous signal and using a calibration signal indicative of a second accurate measurement of the blood pressure.

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